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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | ; zenlisp example program
; By Nils M Holm, 1998-2007
; See the file LICENSE for conditions of use.
; Compute the intersection of some sets:
; (intersection '#abcd '#bcde '#cdef) => '#cd
(define (intersection . a)
(letrec
((intersection3 (lambda (a b r)
(cond ((null a)
(reverse r))
((member (car a) b)
(intersection3 (cdr a) b (cons (car a) r)))
(t (intersection3 (cdr a) b r))))))
(fold (lambda (a b)
(intersection3 a b ()))
(car a)
a)))
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